LP:623315 - Query returns less rows when run with join_cache_level=6 on maria-5.3-dsmrr-cpk

The following query:

SELECT table2 .`pk`
FROM CC
LEFT JOIN CC table2
JOIN CC table3 ON table3 .`col_varchar_key` = table2 .`col_varchar_key`
ON table3 .`col_int_nokey` ;

Returns 469 rows when executed with join_cache_level=6 on maria-5.3-dsmrr-cpk . maria-5.3 , join_cache_level=0 and using IGNORE INDEX to modify the query plan all agree that the query should return 480 rows.